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Cerebellum. 2017 Apr;16(2):340-347. doi: 10.1007/s12311-016-0794-9.

Mutant Ataxin-1 Inhibits Neural Progenitor Cell Proliferation in SCA1.

Author information

1
Department of Neuroscience, University of Minnesota, Minneapolis, MN, USA.
2
Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611, USA.
3
Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611, USA. p-opal@northwestern.edu.
4
Department of Cell and Molecular Biology, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611, USA. p-opal@northwestern.edu.

Abstract

Spinocerebellar ataxia type 1 (SCA1) is a dominantly inherited neurodegenerative disease caused by the expansion of a polyglutamine (Q) repeat tract in the protein ataxin-1 (ATXN1). Beginning as a cerebellar ataxic disorder, SCA1 progresses to involve the cerebral cortex, hippocampus, and brainstem. Using SCA1 knock-in mice that mirror the complexity of the human disease, we report a significant decrease in the capacity of adult neuronal progenitor cells (NPCs) to proliferate. Remarkably, a decrease in NPCs proliferation can be observed in vitro, outside the degenerative milieu of surrounding neurons or glia, demonstrating that mutant ATXN1 acting cell autonomously within progenitor cells interferes with their ability to proliferate. Our findings suggest that compromised adult neurogenesis contributes to the progressive pathology of the disease particularly in areas such as the hippocampus and cerebral cortex where stem cells provide neurotropic factors and participate in adult neurogenesis. These findings not only shed light on the biology of the disease but also have therapeutic implications in any future stem cell-based clinical trials.

KEYWORDS:

Neurogenesis; Proliferation; SCA1; Spinocerebellar ataxia type 1

PMID:
27306906
PMCID:
PMC5510931
DOI:
10.1007/s12311-016-0794-9
[Indexed for MEDLINE]
Free PMC Article

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